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Alternate approach to the calculation of thermal response factors for vertical borehole ground heat exchanger arrays using an incomplete bessel function
(International Ground Source Heat Pump Association, 2017)
This article presents yet another methodology for the calculation of dimensionless thermal response factors for vertical borehole ground heat exchanger (GHX) arrays, which is a concept introduced by Eskilson (1987). The ...
Heat extraction distributed thermal response test: A methodological approach and in-situ experiment
(International Ground Source Heat Pump Association, 2017)
The Thermal Response Test (TRT) is a worldwide adopted in-situ methodology able to estimate the ground thermal conductivity and borehole thermal resistance. During the test the carrier-fluid exchanges a constant heat flux ...
Transient thermal resistance of borehole heat exchangers for hourly simulations of geothermal heat pumps systems
(International Ground Source Heat Pump Association, 2017)
The correct design of borehole fields requires the correct evaluation of the transient ground thermal response in time, but also the accurate estimation of the borehole (BHE) thermal resistance, expecially the grout ...
Analytical solution for optimal mass flow rate in primary circuit of ground-coupled heat pump systems
(International Ground Source Heat Pump Association, 2017)
Ground source heat pump (GSHP) systems extract heat or cold from the ground by circulating a heat carrier uid (HCF) in a ground heat exchanger and inject this energy in buildings. This paper shows that there exists an ...
Investigation on the effects of different time resolutions in the design and simulation of BHE fields
(International Ground Source Heat Pump Association, 2017)
The correct design of a field of Borehole Heat Exch angers (BHE) requires the knowledge of ground thermal properties, heat pump performance and building heating and cooling demand. The sequence o f heat pulses from (to) ...
Numerical simulation of pile geothermal heat exchanger with spiral tube considering its thermo-mechanical behavior
(International Ground Source Heat Pump Association, 2017)
Pile geothermal heat exchanger (PGHE), which utilizes the building foundation piles as part of the geothermal heat exchangers (GHEs) for a ground-coupled heat pump (GCHP) system, has been attracting the interests of ...
Assessment of the gradient of an objective function by analytical derivation for optimization-based design of ground-coupled heat pump systems
(International Ground Source Heat Pump Association, 2017)
Optimization-based design of ground heat exchangers requires derivation of the objective function with respect to the design parameters, which is usually done through finite-differentiation of the cost or utility function. ...
Fractal approach to calculate the thermal conductivity of moist soil
(International Ground Source Heat Pump Association, 2017)
The ground heat exchanger (GHE) is a key component in the design of a GSHP system and the effective thermal conductivity is one of the most important parameters that determine the heat transfer underground. In this paper, ...
Measurement of internal and effective borehole resistances during thermal response tests
(International Ground Source Heat Pump Association, 2017)
In a conventional thermal response test (TRT), the main parameter evaluated is the bulk subsurface thermal conductivity surrounding the borehole. It is also possible to evaluate the borehole thermal resistance. Several ...
Second-order multipole formulas for thermal resistance of single U-tube borehole heat exchangers
(International Ground Source Heat Pump Association, 2017)
The borehole thermal resistance is both an important design parameter and a key performance characteristic of a borehole heat exchanger. Another quantity that is particularly important for deep borehole heat exchangers is ...